ccharles wrote:Does this refer to sleeping after sunrise or after dawn?

It's not altogether certain whether it means (1) oversleeping in the morning, (2) taking siestas at noon, or (3) sleeping at any time during the day. But if it means #1, then much like the English expression "to have a lie-in" the word doesn't entail any stipulation as to whether one sleeps until after sunrise or until after dawn.

...and this thought arose in the mind of the Blessed One:“Who lives without reverence lives miserably.”— Uruvela Sutta, A.ii.20

It were endless to dispute upon everything that is disputable.— William Penn Some Fruits of Solitude,